TIMER ADJUSTMENT
The MF-12 has been designed and built to withstand
rugged shop. Constant, trouble-free operation is as-
sured with a minimum of maintenance. The GUN TIP,
the GROUND CLAMP and all CABLE CONNECTIONS
should be kept clean to maintain a good electrical
contact. Wire brush the parts to remove any oxida-
tion or adhesive that may have accumulated during
the fastening operation.
"HEAT SINK"
The timer dial facing you on the front panel of the
unit, determines the duration of the weld cycle. For
maximum efficiency of the unit, the weld cycle should
be set for the shortest length of time necessary to
provide a good weld. An excessive amount of time does
not improve the weld. On the contrary, the resulting
weld may not be an acceptable one. It is recommended
that at the start of a production run, using a given
length of pin with a given gauge of metal, the opera-
tor take a few moments to determine the minimum
timer setting to perform the job and leave the timer
at that point.
NOTE:
There is a common misconception that the
longer the weld time, the stronger the weld. This is
not true. It is important that you follow the above
instructions for maintaining the minimum weld time.
MAINTENANCE
Included with your MF-12 is a simple “heat sink” tool
that looks somewhat like a cookie cutter. This tool,
when placed behind the point of weld on bare metal,
will eliminate any mark on the metal by dissipating the
heat generated from the point of the weld. The use of
a copper sheet on the work bench will also eliminate
this mark.
ELECTRICAL REQUIREMENTS
Where duct is too large to put on a bench, snap the
ground clamp onto the duct and secure the insula-
tion quickly by welding the Clip Pins inside or outside
of the ducts as required. Eliminate the heat mark on
the duct using the simple “heat sink” supplied on the
opposite side of the weld.
BRING MF-12 TO THE WORK
MF-12 AS A BENCH TOOL
Connect the MF-12 to a 30 amp power supply. (208-
230 volts – 60 cycle). The MF12 uses 208 – 230
volt single phase. To wire to 208-230 volt single
phase, the green lead is ground and the white and
black leads are power. It is suggested that the unit
be permanently wired into a 30 amp disconnect box
fitted with 30 amp slow blow fuses.
To use your work bench as a welding table, set the
MF-12 alongside or on top of the work bench. Cover
the bench top with a copper sheet (.025 inch) which
will act as a permanent ground when the duct work
is placed on the table top. Attach the MF-12 ground
clamp to the duct work or copper bench top. The Clip
Pins will quickly weld every time with no burn marks
or wasted pins due to misfires.
INSTALLING CLIP PINS
Clip Pins are welded as easily as "A", "B", "C".
"A"
Press down through the insu-
lation, twist the gun, and pull
the trigger. Do not release
the trigger until the timer
cycle has ended.
"B"
Position the Clip pin on the
Magnetic tip of hand gun.
The Clip Pins are
permanently welded
in position flush with
the insulation.
"C"
SERVICE
The MF-12 has been designed and built to withstand
rugged shop usage. The Indicator lights on the front
panel will help you to diagnose minor problems. If your
MF-12 fails to operate follow this simple procedure
to find the defective component.
1.
Pull the trigger and watch the lights. The green
light (24 volts) and then the red light (220 volts)
should flash on and off.
2.
If only the green light comes on, go to step 4.
3.
If neither light comes on, press the WELD CYCLE
TEST switch on the front panel.
A.
If both lights flash and the transformers do not
hum go to step 5.
B.
If both lights flash and the transformers hum,
the problem is either a bad trigger switch or
bad switch cable.
C.
If only the green light flashes, go to step 4
D.
If neither light flashes, replace 24 volt trans-
former.
4.
Replace the weld activator.
5.
The problem is probably a bad weld transformer.
Call technical service for further assistance.
(1-800-899-3876)
H. WEISS MACHINERY & SUPPLY
H. WEISS MACHINERY & SUPPLY
PHONE: (718) 605-0395 - www.hweiss.com
